Source:http://linkedlifedata.com/resource/umls/id/C0018768
MSH: Wearable sound-amplifying devices that are intended to compensate for impaired hearing. These generic devices include air-conduction hearing aids and bone-conduction hearing aids. (UMDNS, 1999),CSP: wearable sound-amplifying devices that are intended to compensate for impaired hearing; devices include air-conduction hearing aids and bone-conduction hearing aids.,MEDLINEPLUS: <p>A hearing aid is a small electronic device that you wear in or behind your ear. It magnifies sound vibrations entering the ear. That makes some sounds louder. A hearing aid can help people hear more in both quiet and noisy situations.</p><p> Hearing aids help people who have <a href='http://www.nlm.nih.gov/medlineplus/hearingdisordersanddeafness.html'>hearing loss</a> from damage to the small sensory cells in the inner ear. The damage can occur as a result of disease, aging, or injury from noise or certain medicines. </p><p>Only about one out of five people who would benefit from a hearing aid actually uses one. If you think a hea